US1055988A

US1055988A - Telephony.

Info

Publication number: US1055988A
Application number: US50224309A
Authority: US
Inventors: Elmer R Corwin
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-06-15
Filing date: 1909-06-15
Publication date: 1913-03-11
Anticipated expiration: 1930-03-11

Description

E. R. GORWIN.

TELEPHONY.

APPLICATION FILED JUNE 15. 1909.

1,055,988. Patnted Mar. 11, 1913.

useful Improvement in Telephony, of which in which of-its casing being absent) made in accord-' ance with the preferred embodiment of the the exchange is connected with the line exis located. I have illustrate amen n. QORWIN, or

CHICAGO, ILLINOIS.

TELEPHONY;

Specification of Letters Patent.

Patented Mar. 11, 1913.

To 'aZZ whom. it. may concern:

Be it known that I, ELMER R. CORWIN, citizen. of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and the following is a full, clear, concise, and exact description, reference beinghad to the accompanying drawings, forming a part of this specification.

My invention relates to telephony, and hasfor one of its objects the provisi of a. telephone exchange system wherein the common battery may be employed f0 energizing the receivers at sub-stations whe thelines are united in conversation. r

I will explain my invention very fully by reference to the accompanying drawing,

Figure 1 is a diagrammatic view illustrating a telephone exchange system equipped in accordance with the preferred embodiment of the invention. Fig. 2 is a longitudinal sectional view of a receiver (a part invention. Fig. 3 is a plan View of a plate adapted to be secured with respect to the receiver casing. Fig. iis a view showing the electro-ma'gnet structure, one of the plates shown in Fig. 3 being absent Fig. 5 is an elevation showing the assembly of the structures illustrated in Figs. 3 and 4. Fig. 6 is a plan View of the structure shown in Fig. 5.

Like parts are indicated by similarv characters of reference throughout the differentfigures.

I have illustrated metallic circuit telephone lines, but it is to be understood that. the invention may be employed with grounded lines. V

The sides 1 and 2 of each telephone line illustrated extend to the exchange, where they are connected with the tip and

sleeve contacts

3, 4 of a jack switch. At each of the substations I have illustrated a trans mitter 5, which is preferably included serially in the line between the sides thereof, battery current being supplied to the transmitter when'the cord circuit illustrated at tending to the station where thetransrnitter at the exchange a plug 6 and a common battery 7, which common battery is shown connected Application filed Jane 15, 1909. Serial No. 502,243.

in a conventional manner between the sides of the cord circuit for the purpose of sup plying the transmitter with current as; stated. I have not indicated at the exchange .any signaling apparatus, nor any of the operators telephonic apparatus, as these are:

so well known as not'to require illustration.

I have shown my improved receiver 8 at each telephone sub-station, and willfirst de- -scribe the circuit relation thereof in connection with Fig. 1 and will thereafter describe the structural character-istics thereof in. connection with the remaining figures.

This telephone receiver does not have a permanently magnetized core, but, instead, has a readily-magnetlzable and demagnetizable iron core which is formed to present its polar ends to the receiver diaphragm, the

polar ends of the core carrying the voice

current windings

9 and 10, which are in parallel relation with each other and to-- 'gether are in serial relation with the line and the transmitter, these voice current windings performing the double function of energizing the core of the receiver due to the passage of direct current from the battery 7 through said windings and also being responsive to voice currents passed over the lines, the

windings

9 and 10 being wound to present little impedance to the voice currents but being of sufficiently low resistance .to permit of the proper transmission of current from the common battery, the ohmic resistance of each of the windings being preferably fifty ohms. The

windings

9 and 10 are so related to each other and to the common battery, that they will so magnetize the core of the receiver as to cause one pole of saidcoreto have a positive sign and the other pole of said core to have a negative sign. The joint resistance afforded by these windings is thus equal to one-half of the .resistance that is presented by each winding alone. By this arrangement, therefore, I am enabled to secure a receiver which is well adapted torespond to incoming telephonic currents and which at the same timeis well adapted to permit of the transmission of current from the energizing source 7 through the receiver, for the purpose of energizing it, and through the transmitter 5,

. for the purpose of supplying the same with operating current, have illustrated at each telephone station a switch-hook 11 havng an upper contact -for including the re ceiver and transmitter in serial relation with the line when the switch-hook is relieved of the weight of the receiver and for including the'signal bell 12 and condenser 13 in bridge of the line when the switch-hook supports the receiver. I

I will now describe the improved structural characteristics of the receiver of my the same magnetic circuit and are spread apart at their polar ends in order to perinit of the disposition of the windings 9 10 about said polar ends. In this feature of my invention, the core portions are preferably formed of soft metal, but inasmuch as this feature of my invention is of a structural nature, I do not wish to be limited to the use of soft iron for the core portions. The polar portions of the receiver core are notched at 14 just back of the polar faces of the core and in front of the voice coils 9 10.

A shallow pan 15 has its base provided with two apertures 16 that are shaped at their outer sides 17'to permit the polar portions of the receiver to pass therethrough and are shaped at their inner sides 18 only to receive the portions ,of the polar extremities of the core that are reduced by the notches at 14 the'height of the notches at 14: being such as to correspond with the thipkness of the pan 15, so thatethe bottom of said pan may he slipped into said noiches when the pan bottom is brought into register with sa d notches. In assembling the parts, the portions of the core are engaged with" the pan bottom in the manner which has been described, whereafter the portions formin the core are clamped together, whereby the pan 15 and the core of the receiver are very firmly in terlocked. The rim of the pan 15 is suiii- (iently elevated from. the bottom thereof as to permit tlc diaphragm 19 to rest within operative range of the polar faces of the core portion it. The pan is fastened to some suitable form of easing, such as that illustrated at 20. By the arrangement which I have described, the voice coils are upon one side of the pan and the polar projections of the receiver core are upon the other side of the pan. \Vhen the pan bott m and the core are to be interlocked, a filative lateral movement is brought about between the core and the pan bottom, a reverse lateral movement permitting of the disengagement oft'he pan bottom and core.

The conductors which lead to the voice current winding are provided each with a terminal 21 formed preferably out of thick strip brass, these terminals, in turn, being connected with the joint terminals of the receiver coils. These terminals are disposed between two strips of insulation 22 which have interlocking connection with the terminals to prevent movement of the terminals withrespect to the strips of insulation when the strips of insulation and the terminals are assembled. The core of the receiver is disposed-between the strips of insulation and a single fastening screw 23 is passed through the core and the strips of insulation and serves to bind the core, the strips of insulation and the terminals in fixedrelation.

While I have herein shown and particularly described the preferred embodiment of my invention, I do not wish to be limited to the precise construction and arrangement set forth, as changes may readily be made without depart-ing'from the spirit of the invention. 1

Having thus described my invention, I claim as new and desire to secure by Letters Patent the following z- 1. A telephone system including a telephone line extending between a telephone station and an exchange, a source ofdirect current at the exchange for supplying cur-. rent to the telephone line, the telephone receiver at said station including a readily magnetizable and demagnetizable core and having two voice current windings each of low impedance and in parallel relation with each other and in serial relation with the line and both adapted to be traversed by telephonic current and thereupon cooperating to operate the receiver and both being also adapted to be traversed by direct current from said source of direct current to magnetize the core of the receiver, the transmitter at said telephone station being in serial relation with the line and the two voice current windings taken together, whereby said transmitter may also be supplied with direct current from said source of direct current.

2. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including two voice current windingscach of low impedance and in parallel relation with each other and in serial relation with the line and both adapted to be traversed by telephonic current and thereupon cooperating to operate the receiver and both being also adapted to be traversed by direct current from said source memes of direct current to energize the receiver,

the transmitter at said telephone station beceiver at said station including a readily magnetizable and demagnetizable core and having two voice current windings each of low impedance and in parallel relation with each other and in serlal relation with the both adapted to1be traversed by line an I telephonic current and thereupon ccoperat' ing to operate the receiver and both being also adapted to be traversed'by direct current from said-source of direct current to magnetize the core of the receiver.

4..A telephone system including a telephone line extending between a telephone station and an exchange,a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including two voice current windings each of low 1m edanoe' and 1n parallel relation wlth each 01: er and in serial relation with the'line and both adapted to be traversed by telephonic current and thereupon cooperating to operate the receiver and both being also adapted to be traversed by direct current from said source of direct current to energize the receiver.

5. A telephone system including a telephone line extending between a telephone station and a source of direct current, the

telephone receiver at said station including a readily magnetizable and demagnetizable core and having two voice current windings each of low impedance and in parallel relation with each other and in serial relation with the line and both adapted to be traversed by telephonic current and. thereupon cooperating to operate the receiver and both being also adapted to be traversed by direct,

current from said source of direct current to magnetize the core of the receiver, the transmitterat said telephone. station being in serial relation with the line and the two voice ,current windings taken together, whereby said transmitter may also be supplied withdirect current from said source of direct current.

6. A telephone system includinga tele' phone line extending between a telephone station and a source of direct current, the

telephone receiver at said station including two voice current windings each of low impedance and'in parallel relation with each other and in serial relation with the line and bothadapted to be traversed by telephonic current and thereupon cooperat-' ing to operate the receiver and both being also adapted to be traversed by direct current from'said source of direct current to energize the receiver, the transmitter at said telephone station, being in serial relation with the line and the two voice current windings taken together, whereby said transmitter may also be supplied with direct current from said source of direct current. 7. A telephone system including a telephone line extending between a telephone station and a source of direct current, the telephone receiver at said station including a readily magnetizable and demagnetizable 'core and having two voice current windings each of low impedance and in parallel relation with each other and in serial relation with the line and both adapted to be traversed by telephonic current and thereupon coiiperating to-operate the receiver and both being also adapted to be traversed by direct current from said source of direct current to magnetize the core of the receiver.

8. A telephone system including a telephone line extending between a telephone station and a source of direct current, the telephone receiver at said station including two voice. current windings each of low impedance and in parallel relation with each other and in serial relation with the line a and both adapted to be traversed by telephonic current and thereupon cooperating to operate the receiver and both being also adapted to be traversed by direct current from said sourceof direct current to ener-- gize the receiver.

9. A telephone system -including a telephone line extending-between a telephone station and an exchange, a'source of direct current at theexchange for supplying current to the telephone line, the telephone receiver at said station including a readily rnagnetizable and. demagnetizable core and having two windings in arallel relation with each other and in serial relation with tlte'line at least one of said windings being traversed by telephoniccurrent and both being adapted to be traversed bydirect current from said source of direct current to magnetize the, core of the receiver, the transmitterat said telephone station being in .se-

rial relation with the line and the two windings taken together, whereby said transmitter may also beisupplied with direct current from said source of direct current.

10. Atelephone systemincluding a telephone line extending between a. telephone station and an exchange, a source of. direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including two wind- -ings in parallel relation with each other and-in serial relationiwit-h the line at least I &

one of said windings being adapted to be traversed by telephonic current and both being adapted to be traversed by direct current from said source of direct current to energize the receiver, the transmitter at said telephone station being in serial relation with the line and the two windings taken together, whereby said transmitter may also besupplied with direct current from said source of direct. current.

11. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including a readily magnetizable and demagnetizablecore and having two windings in parallel relation with each other and in serial relation with the line at least one of said windings being adapted to be traversed by telephonic current and both being adapted to be traversed by direct current from said source of direct current to inagnetize the core of the receiver.

12. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including two windings in parallel relation with each other and in serial relation with the line at least one of said windings being adapted to be trav ersed by telephonic current and both being adapted to be traversed by direct current from said source of direct current to energize the receiver.

13. A telephone system including a telephoneline extending between a telephone station and a source of direct current, the telephone receiver at said station including a readily magnetizable and demagnetizable core and having two windings in parallel relation with each other and in serial relation with the-line atleast one of said windings being adapted to be traversed by telephonic currentand both being adapted to be traversed by direct current from said source of direct current to magnetize the core of the receiver, the transmitter at said telephone station being in serial relation with the line and thetwo windings taken together, whereby said transmitter may also be supplied with direct current from said source of direct current.

14. A telephone system including a tele phone line extending between a telephone station and a source of direct current, the telephone receiver at said station including two windings in parallel relation with each other and in serial relation with the line at least one of said windings being adapted to be traversed by telephonic current and both being adapted to be traversed by direct current from said source or direct current to energize the receiver, the transmitter at said telephone station being in serial relation with the line and the two windings taken together, whereby said transmitter may also be supplied with direct current from said source of direct current.

15. A telephone system including a telephone line extending between a telephone station and a source of direct current, the telephone receiver at said station including a readily magnetizable and demagnetizable core and having two windings in parallel relation with each other and in serial relation with the line at least one of said windings being adapted to be traversed by telephonic current and both being adapted to be traversed by direct current from said source of direct current to magnetize the core of the receiver.

16. A telephone system including a telephone line extending between a telephone station and a source of direct current, the

telephone receiver at said station including phone line extending between a telephone station and-an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including a magnetizable core and having two circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by current from said source of direct current, and each including a winding serving to magnetize the receiver core, due to the passage of the direct current, one of said windings serving to permit of the passage of voice currents, the transmitter at said station being in serial relation with the circuits of the receiver taken together, and thereby being adapted to be supplied also with current emanating from the source of direct current.

18. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station having two receiver energizing circuits in parallel relation with each other and in serial relation with the line and both adapted to be'traversed by direct current from said source of direct current, to energize the receiver, one of said windings serving to permit of the passage of voice currents, the transmitter at said station .being-inserial relation with the circuits of the receiver taken together, and thereby being adapted to be supplied also with current emanating from the source of direct current. i

19. A telephone system including a tele phone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplyingcurrent to the telephone line, the telephone re ceiver at said station including a magnetizable core and having two circuits in parallel relation With each other and in serialrelm tion with the line and both aolaptetl to be traversed by current from said source of direct current, and each including a Winding serving to magnetize the receiver core, clue to the passage of the direct current, one of said windings serving to permit of the pas-- sage of voice currents.

20. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station having two receiver, energizing circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by clirect current from said source of direct current to energize the receiver, one of said windings s rving-topermit of the passage of voice currents In Witness whereof, I hereunto subscribe my name this 14th. day of JuneA. I1, 1909.

ELMER COEWIN.

Witnesses L. Gm S'rnon, G. L. Cease.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C.